Referencing the Accent Color from the theme

Hi.

I want to be able to reference the accent color from the theme wherever I can write a color so that, if I change the accent color, all these colors are updated at once. Is there a way to do that? Like (accent) instead of 123456.

Currently I copy my color everywhere, but I do not like that.

If we were able to adapt the color from the accent too, it would be perfect: like (accent-60%) or (accent)-60%... instead of 123456.

Thanks.